submodule: bump openthread from `d015004` to `af2c77e` #1744

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Job	Run time
pretty	1m 4s
arm-gcc-4	15m 45s
arm-gcc-5	15m 46s
arm-gcc-6	15m 29s
arm-gcc-7	16m 15s
arm-gcc-9	16m 42s
	1h 21m 1s